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So this style of add-a-fuse lets you reuse the original fuse (to protect the original part of the circuit) and add a new one to protect the accessory you are adding. Both slots will need a fuse in them.
AFAIK you can get these with varying amperage ratings. So if you are tapping into an existing 15A fuse, you need one rated for at least that. The accessory you are adding can be 15A or less. The amazon link above seems to accommodate 15A fuses.
I've only used these myself for 10A or less for adding a dashcam, so I haven't run into needing one for 15A.
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